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authorMartin Michlmayr <tbm@cyrius.com>2012-10-04 17:11:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-06 03:04:37 +0900
commit0f6d93aa9d96cc9022b51bd10d462b03296be146 (patch)
tree85776a4c9b1602646405fd7f5f4c336824b2b0f6 /include/linux/init.h
parent82e54a6aaf8aec971fb16afa3a4404e238a1b98b (diff)
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drivers/scsi/atp870u.c: fix bad use of udelay
The ACARD driver calls udelay() with a value > 2000, which leads to to the following compilation error on ARM: ERROR: "__bad_udelay" [drivers/scsi/atp870u.ko] undefined! make[1]: *** [__modpost] Error 1 This is because udelay is defined on ARM, roughly speaking, as #define udelay(n) ((n) > 2000 ? __bad_udelay() : \ __const_udelay((n) * ((2199023U*HZ)>>11))) The argument to __const_udelay is the number of jiffies to wait divided by 4, but this does not work unless the multiplication does not overflow, and that is what the build error is designed to prevent. The intended behavior can be achieved by using mdelay to call udelay multiple times in a loop. [jrnieder@gmail.com: adding context] Signed-off-by: Martin Michlmayr <tbm@cyrius.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/init.h')
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