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authorRaghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>2016-04-25 23:31:26 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2016-04-29 19:08:24 -0400
commit07beca2be24cc710461c0b131832524c9ee08910 (patch)
treee47525202f3a89f258e5d376de8987f13dc1829c /drivers/scsi/aacraid
parent116d77fea02e2a5aded7d29ba4c692774cb339f1 (diff)
downloadlinux-07beca2be24cc710461c0b131832524c9ee08910.tar.bz2
aacraid: Relinquish CPU during timeout wait
aac_fib_send has a special function case for initial commands during driver initialization using wait < 0(pseudo sync mode). In this case, the command does not sleep but rather spins checking for timeout.This loop is calls cpu_relax() in an attempt to allow other processes/threads to use the CPU, but this function does not relinquish the CPU and so the command will hog the processor. This was observed in a KDUMP "crashkernel" and that prevented the "command thread" (which is responsible for completing the command from being timed out) from starting because it could not get the CPU. Fixed by replacing "cpu_relax()" call with "schedule()" Cc: stable@vger.kernel.org Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/aacraid')
-rw-r--r--drivers/scsi/aacraid/commsup.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 511bbc575062..725aa78cab61 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -637,10 +637,10 @@ int aac_fib_send(u16 command, struct fib *fibptr, unsigned long size,
}
return -EFAULT;
}
- /* We used to udelay() here but that absorbed
- * a CPU when a timeout occured. Not very
- * useful. */
- cpu_relax();
+ /*
+ * Allow other processes / CPUS to use core
+ */
+ schedule();
}
} else if (down_interruptible(&fibptr->event_wait)) {
/* Do nothing ... satisfy