[PATCH] USB: convert the semaphores in the sisusb driver to mutexes

From: Arjan van de Ven <arjan@infradead.org>

Convert the semaphores-used-as-mutex to mutexes in the sisusb video driver;
this required manual checking due to the "return as locked" stuff in this
driver, but the ->lock semaphore is still used as mutex in the end.

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Cc: Thomas Winischhofer <winischhofer.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 65 insertions, 64 deletions

diff --git a/drivers/usb/misc/sisusbvga/sisusb_con.c b/drivers/usb/misc/sisusbvga/sisusb_con.c
index be5c1a25ae21..092281c172a1 100644
--- a/drivers/usb/misc/sisusbvga/sisusb_con.c
+++ b/drivers/usb/misc/sisusbvga/sisusb_con.c
@@ -48,6 +48,7 @@
  */
 
 #include <linux/config.h>
+#include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/signal.h>
@@ -102,7 +103,7 @@ static struct sisusb_usb_data *mysisusbs[MAX_NR_CONSOLES];
 /* Forward declaration */
 static const struct consw sisusb_con;
 
-extern struct semaphore disconnect_sem;
+extern struct mutex disconnect_mutex;
 
 static inline void
 sisusbcon_memsetw(u16 *s, u16 c, unsigned int count)
@@ -194,11 +195,11 @@ sisusb_get_sisusb_lock_and_check(unsigned short console)
 	if (!(sisusb = sisusb_get_sisusb(console)))
 		return NULL;
 
-	down(&sisusb->lock);
+	mutex_lock(&sisusb->lock);
 
 	if (!sisusb_sisusb_valid(sisusb) ||
 	    !sisusb->havethisconsole[console]) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return NULL;
 	}
 
@@ -236,18 +237,18 @@ sisusbcon_init(struct vc_data *c, int init)
 	 * are set up/restored.
 	 */
 
-	down(&disconnect_sem);
+	mutex_lock(&disconnect_mutex);
 
 	if (!(sisusb = sisusb_get_sisusb(c->vc_num))) {
-		up(&disconnect_sem);
+		mutex_unlock(&disconnect_mutex);
 		return;
 	}
 
-	down(&sisusb->lock);
+	mutex_lock(&sisusb->lock);
 
 	if (!sisusb_sisusb_valid(sisusb)) {
-		up(&sisusb->lock);
-		up(&disconnect_sem);
+		mutex_unlock(&sisusb->lock);
+		mutex_unlock(&disconnect_mutex);
 		return;
 	}
 
@@ -284,9 +285,9 @@ sisusbcon_init(struct vc_data *c, int init)
 	if (!*c->vc_uni_pagedir_loc)
 		con_set_default_unimap(c);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
-	up(&disconnect_sem);
+	mutex_unlock(&disconnect_mutex);
 
 	if (init) {
 		c->vc_cols = cols;
@@ -306,14 +307,14 @@ sisusbcon_deinit(struct vc_data *c)
 	 * and others, ie not under our control.
 	 */
 
-	down(&disconnect_sem);
+	mutex_lock(&disconnect_mutex);
 
 	if (!(sisusb = sisusb_get_sisusb(c->vc_num))) {
-		up(&disconnect_sem);
+		mutex_unlock(&disconnect_mutex);
 		return;
 	}
 
-	down(&sisusb->lock);
+	mutex_lock(&sisusb->lock);
 
 	/* Clear ourselves in mysisusbs */
 	mysisusbs[c->vc_num] = NULL;
@@ -332,12 +333,12 @@ sisusbcon_deinit(struct vc_data *c)
 		}
 	}
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	/* decrement the usage count on our sisusb */
 	kref_put(&sisusb->kref, sisusb_delete);
 
-	up(&disconnect_sem);
+	mutex_unlock(&disconnect_mutex);
 }
 
 /* interface routine */
@@ -417,7 +418,7 @@ sisusbcon_putc(struct vc_data *c, int ch, int y, int x)
 #endif
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
@@ -425,7 +426,7 @@ sisusbcon_putc(struct vc_data *c, int ch, int y, int x)
 	sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(x, y),
 				(u32)SISUSB_HADDR(x, y), 2, &written);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 }
 
 /* Interface routine */
@@ -453,14 +454,14 @@ sisusbcon_putcs(struct vc_data *c, const unsigned short *s,
 		sisusbcon_writew(sisusbcon_readw(s++), dest++);
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
 	sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(x, y),
 				(u32)SISUSB_HADDR(x, y), count * 2, &written);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 }
 
 /* Interface routine */
@@ -504,7 +505,7 @@ sisusbcon_clear(struct vc_data *c, int y, int x, int height, int width)
 	}
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
@@ -514,7 +515,7 @@ sisusbcon_clear(struct vc_data *c, int y, int x, int height, int width)
 	sisusb_copy_memory(sisusb, (unsigned char *)SISUSB_VADDR(x, y),
 				(u32)SISUSB_HADDR(x, y), length, &written);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 }
 
 /* Interface routine */
@@ -576,7 +577,7 @@ sisusbcon_bmove(struct vc_data *c, int sy, int sx,
 #endif
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
@@ -586,7 +587,7 @@ sisusbcon_bmove(struct vc_data *c, int sy, int sx,
 	sisusb_copy_memory(sisusb, (unsigned char *)SISUSB_VADDR(dx, dy),
 				(u32)SISUSB_HADDR(dx, dy), length, &written);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 }
 
 /* interface routine */
@@ -609,7 +610,7 @@ sisusbcon_switch(struct vc_data *c)
 
 	/* Don't write to screen if in gfx mode */
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return 0;
 	}
 
@@ -618,7 +619,7 @@ sisusbcon_switch(struct vc_data *c)
 	 * as origin.
 	 */
 	if (c->vc_origin == (unsigned long)c->vc_screenbuf) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		printk(KERN_DEBUG "sisusb: ASSERT ORIGIN != SCREENBUF!\n");
 		return 0;
 	}
@@ -635,7 +636,7 @@ sisusbcon_switch(struct vc_data *c)
 				(u32)SISUSB_HADDR(0, 0),
 				length, &written);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 0;
 }
@@ -657,7 +658,7 @@ sisusbcon_save_screen(struct vc_data *c)
 	/* sisusb->lock is down */
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
@@ -669,7 +670,7 @@ sisusbcon_save_screen(struct vc_data *c)
 	sisusbcon_memcpyw((u16 *)c->vc_screenbuf, (u16 *)c->vc_origin,
 								length);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 }
 
 /* interface routine */
@@ -690,7 +691,7 @@ sisusbcon_set_palette(struct vc_data *c, unsigned char *table)
 	/* sisusb->lock is down */
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return -EINVAL;
 	}
 
@@ -705,7 +706,7 @@ sisusbcon_set_palette(struct vc_data *c, unsigned char *table)
 			break;
 	}
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 0;
 }
@@ -728,7 +729,7 @@ sisusbcon_blank(struct vc_data *c, int blank, int mode_switch)
 		sisusb->is_gfx = blank ? 1 : 0;
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return 0;
 	}
 
@@ -777,7 +778,7 @@ sisusbcon_blank(struct vc_data *c, int blank, int mode_switch)
 			cr63  = 0x40;
 			break;
 		default:
-			up(&sisusb->lock);
+			mutex_unlock(&sisusb->lock);
 			return -EINVAL;
 		}
 
@@ -788,7 +789,7 @@ sisusbcon_blank(struct vc_data *c, int blank, int mode_switch)
 
 	}
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return ret;
 }
@@ -809,7 +810,7 @@ sisusbcon_scrolldelta(struct vc_data *c, int lines)
 	/* sisusb->lock is down */
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return 0;
 	}
 
@@ -849,7 +850,7 @@ sisusbcon_scrolldelta(struct vc_data *c, int lines)
 
 	sisusbcon_set_start_address(sisusb, c);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 1;
 }
@@ -867,7 +868,7 @@ sisusbcon_cursor(struct vc_data *c, int mode)
 	/* sisusb->lock is down */
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
@@ -879,7 +880,7 @@ sisusbcon_cursor(struct vc_data *c, int mode)
 	if (mode == CM_ERASE) {
 		sisusb_setidxregor(sisusb, SISCR, 0x0a, 0x20);
 		sisusb->sisusb_cursor_size_to = -1;
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return;
 	}
 
@@ -919,7 +920,7 @@ sisusbcon_cursor(struct vc_data *c, int mode)
 		sisusb->sisusb_cursor_size_to   = to;
 	}
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 }
 
 static int
@@ -961,7 +962,7 @@ sisusbcon_scroll_area(struct vc_data *c, struct sisusb_usb_data *sisusb,
 	sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(0, t),
 				(u32)SISUSB_HADDR(0, t), length, &written);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 1;
 }
@@ -994,7 +995,7 @@ sisusbcon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
 	/* sisusb->lock is down */
 
 	if (sisusb_is_inactive(c, sisusb)) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return 0;
 	}
 
@@ -1084,7 +1085,7 @@ sisusbcon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
 
 	c->vc_pos = c->vc_pos - oldorigin + c->vc_origin;
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 1;
 }
@@ -1106,7 +1107,7 @@ sisusbcon_set_origin(struct vc_data *c)
 	/* sisusb->lock is down */
 
 	if (sisusb_is_inactive(c, sisusb) || sisusb->con_blanked) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return 0;
 	}
 
@@ -1116,7 +1117,7 @@ sisusbcon_set_origin(struct vc_data *c)
 
 	sisusb->con_rolled_over = 0;
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 1;
 }
@@ -1133,7 +1134,7 @@ sisusbcon_resize(struct vc_data *c, unsigned int newcols, unsigned int newrows)
 
 	fh = sisusb->current_font_height;
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	/* We are quite unflexible as regards resizing. The vt code
 	 * handles sizes where the line length isn't equal the pitch
@@ -1167,7 +1168,7 @@ sisusbcon_do_font_op(struct sisusb_usb_data *sisusb, int set, int slot,
 
 	if ((slot != 0 && slot != 2) || !fh) {
 		if (uplock)
-			up(&sisusb->lock);
+			mutex_unlock(&sisusb->lock);
 		return -EINVAL;
 	}
 
@@ -1327,7 +1328,7 @@ sisusbcon_do_font_op(struct sisusb_usb_data *sisusb, int set, int slot,
 	}
 
 	if (uplock)
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 
 	if (dorecalc && c) {
 		int i, rows = c->vc_scan_lines / fh;
@@ -1351,7 +1352,7 @@ sisusbcon_do_font_op(struct sisusb_usb_data *sisusb, int set, int slot,
 
 font_op_error:
 	if (uplock)
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 
 	return -EIO;
 }
@@ -1417,19 +1418,19 @@ sisusbcon_font_get(struct vc_data *c, struct console_font *font)
 	font->charcount = 256;
 
 	if (!font->data) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return 0;
 	}
 
 	if (!sisusb->font_backup) {
-		up(&sisusb->lock);
+		mutex_unlock(&sisusb->lock);
 		return -ENODEV;
 	}
 
 	/* Copy 256 chars only, like vgacon */
 	memcpy(font->data, sisusb->font_backup, 256 * 32);
 
-	up(&sisusb->lock);
+	mutex_unlock(&sisusb->lock);
 
 	return 0;
 }
@@ -1512,14 +1513,14 @@ sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
 {
 	int i, ret, minor = sisusb->minor;
 
-	down(&disconnect_sem);
+	mutex_lock(&disconnect_mutex);
 
-	down(&sisusb->lock);
+	mutex_lock(&sisusb->lock);
 
 	/* Erm.. that should not happen */
 	if (sisusb->haveconsole || !sisusb->SiS_Pr) {
-		up(&sisusb->lock);
-		up(&disconnect_sem);
+		mutex_unlock(&sisusb->lock);
+		mutex_unlock(&disconnect_mutex);
 		return 1;
 	}
 
@@ -1529,15 +1530,15 @@ sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
 	if (first > last ||
 	    first > MAX_NR_CONSOLES ||
 	    last > MAX_NR_CONSOLES) {
-		up(&sisusb->lock);
-		up(&disconnect_sem);
+		mutex_unlock(&sisusb->lock);
+		mutex_unlock(&disconnect_mutex);
 		return 1;
 	}
 
 	/* If gfxcore not initialized or no consoles given, quit graciously */
 	if (!sisusb->gfxinit || first < 1 || last < 1) {
-		up(&sisusb->lock);
-		up(&disconnect_sem);
+		mutex_unlock(&sisusb->lock);
+		mutex_unlock(&disconnect_mutex);
 		return 0;
 	}
 
@@ -1547,8 +1548,8 @@ sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
 
 	/* Set up text mode (and upload  default font) */
 	if (sisusb_reset_text_mode(sisusb, 1)) {
-		up(&sisusb->lock);
-		up(&disconnect_sem);
+		mutex_unlock(&sisusb->lock);
+		mutex_unlock(&disconnect_mutex);
 		printk(KERN_ERR
 			"sisusbvga[%d]: Failed to set up text mode\n",
 			minor);
@@ -1571,16 +1572,16 @@ sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
 
 	/* Allocate screen buffer */
 	if (!(sisusb->scrbuf = (unsigned long)vmalloc(sisusb->scrbuf_size))) {
-		up(&sisusb->lock);
-		up(&disconnect_sem);
+		mutex_unlock(&sisusb->lock);
+		mutex_unlock(&disconnect_mutex);
 		printk(KERN_ERR
 			"sisusbvga[%d]: Failed to allocate screen buffer\n",
 			minor);
 		return 1;
 	}
 
-	up(&sisusb->lock);
-	up(&disconnect_sem);
+	mutex_unlock(&sisusb->lock);
+	mutex_unlock(&disconnect_mutex);
 
 	/* Now grab the desired console(s) */
 	ret = take_over_console(&sisusb_con, first - 1, last - 1, 0);