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Old 02-17-2008, 04:24 PM
James Bottomley
 
Default gdth: don't call pci_free_consistent under spinlock

Bug: #199934

picked from upstream ff83efacf2b77a1fe8942db6613825a4b80ee5e2

The spinlock is held over too large a region: pscratch is a permanent
address (it's allocated at boot time and never changes). All you need
the smp lock for is mediating the scratch in use flag, so fix this by
moving the spinlock into the case where we set the pscratch_busy flag
to false.

Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
---
drivers/scsi/gdth_proc.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/gdth_proc.c b/drivers/scsi/gdth_proc.c
index de57734..ce0228e 100644
--- a/drivers/scsi/gdth_proc.c
+++ b/drivers/scsi/gdth_proc.c
@@ -694,15 +694,13 @@ static void gdth_ioctl_free(gdth_ha_str *ha, int size, char *buf, ulong64 paddr)
{
ulong flags;

- spin_lock_irqsave(&ha->smp_lock, flags);
-
if (buf == ha->pscratch) {
+ spin_lock_irqsave(&ha->smp_lock, flags);
ha->scratch_busy = FALSE;
+ spin_unlock_irqrestore(&ha->smp_lock, flags);
} else {
pci_free_consistent(ha->pdev, size, buf, paddr);
}
-
- spin_unlock_irqrestore(&ha->smp_lock, flags);
}

#ifdef GDTH_IOCTL_PROC
--
1.5.4.3


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