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| author | Matthew Wilcox <matthew@wil.cx> | 2006-03-29 14:45:18 -0700 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2006-04-13 10:13:30 -0500 |
| commit | d637c4543fdc86cbef5805c679d24bb665172a7d (patch) | |
| tree | 45ed36215b8e2623e75d02ab76ff2e50a3e937a0 | |
| parent | 80286d478c2b0e07959e79cf34591a4061ff1797 (diff) | |
| download | linux-d637c4543fdc86cbef5805c679d24bb665172a7d.tar.gz linux-d637c4543fdc86cbef5805c679d24bb665172a7d.tar.bz2 linux-d637c4543fdc86cbef5805c679d24bb665172a7d.zip | |
[SCSI] sym2: Fix build when spinlock debugging is enabled
When spinlock debugging is turned on, a struct completion grows beyond the
size allowed for the scsi_pointer. So move the struct completion back onto
the stack. The additional memory barriers are to keep us from completing
a random piece of kernel stack if the command happens to complete after
the error handling has finished.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
| -rw-r--r-- | drivers/scsi/sym53c8xx_2/sym_glue.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c index 2c4e5f1e7a94..9c83b4d39a26 100644 --- a/drivers/scsi/sym53c8xx_2/sym_glue.c +++ b/drivers/scsi/sym53c8xx_2/sym_glue.c @@ -140,11 +140,11 @@ static struct scsi_transport_template *sym2_transport_template = NULL; * Driver private area in the SCSI command structure. */ struct sym_ucmd { /* Override the SCSI pointer structure */ - struct completion done; - void (*old_done)(struct scsi_cmnd *); - dma_addr_t data_mapping; - int to_do; - u_char data_mapped; /* corresponds to data_mapping above */ + dma_addr_t data_mapping; + unsigned char data_mapped; + unsigned char to_do; /* For error handling */ + void (*old_done)(struct scsi_cmnd *); /* For error handling */ + struct completion *eh_done; /* For error handling */ }; #define SYM_UCMD_PTR(cmd) ((struct sym_ucmd *)(&(cmd)->SCp)) @@ -713,7 +713,7 @@ static void sym_eh_done(struct scsi_cmnd *cmd) cmd->scsi_done = ucmd->old_done; if (ucmd->to_do == SYM_EH_DO_WAIT) - complete(&ucmd->done); + complete(ucmd->eh_done); } /* @@ -728,6 +728,7 @@ static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd) SYM_QUEHEAD *qp; int to_do = SYM_EH_DO_IGNORE; int sts = -1; + struct completion eh_done; dev_warn(&cmd->device->sdev_gendev, "%s operation started.\n", opname); @@ -742,8 +743,10 @@ static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd) } if (to_do == SYM_EH_DO_WAIT) { - init_completion(&ucmd->done); + init_completion(&eh_done); ucmd->old_done = cmd->scsi_done; + ucmd->eh_done = &eh_done; + wmb(); cmd->scsi_done = sym_eh_done; } @@ -779,8 +782,9 @@ static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd) spin_unlock_irq(host->host_lock); if (to_do == SYM_EH_DO_WAIT) { - if (!wait_for_completion_timeout(&ucmd->done, 5*HZ)) { + if (!wait_for_completion_timeout(&eh_done, 5*HZ)) { ucmd->to_do = SYM_EH_DO_IGNORE; + wmb(); sts = -2; } } |