[PATCH 1/8] ipr: Prevent overlapped adapter resets

[Brian King <brking@xxxxxxxxxxxxxxxxxx>]

This patch fixes some scenarios where an ipr adapter
could get reset overlapped, which could cause very
long timeouts to occur, or PCI bus errors.

Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
---

 drivers/scsi/ipr.c |   24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff -puN drivers/scsi/ipr.c~ipr_fix_overlapped_resets drivers/scsi/ipr.c
--- linux-2.6/drivers/scsi/ipr.c~ipr_fix_overlapped_resets	2007-04-26 09:15:37.000000000 -0500
+++ linux-2.6-bjking1/drivers/scsi/ipr.c	2007-04-26 09:17:16.000000000 -0500
@@ -2635,8 +2635,13 @@ static ssize_t ipr_store_diagnostics(str
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 
-	wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
 	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	while(ioa_cfg->in_reset_reload) {
+		spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+		wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
+		spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	}
+
 	ioa_cfg->errors_logged = 0;
 	ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NORMAL);
 
@@ -2958,6 +2963,11 @@ static int ipr_update_ioa_ucode(struct i
 	unsigned long lock_flags;
 
 	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	while(ioa_cfg->in_reset_reload) {
+		spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+		wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
+		spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	}
 
 	if (ioa_cfg->ucode_sglist) {
 		spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
@@ -7434,6 +7444,12 @@ static void __ipr_remove(struct pci_dev 
 	ENTER;
 
 	spin_lock_irqsave(ioa_cfg->host->host_lock, host_lock_flags);
+	while(ioa_cfg->in_reset_reload) {
+		spin_unlock_irqrestore(ioa_cfg->host->host_lock, host_lock_flags);
+		wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
+		spin_lock_irqsave(ioa_cfg->host->host_lock, host_lock_flags);
+	}
+
 	ipr_initiate_ioa_bringdown(ioa_cfg, IPR_SHUTDOWN_NORMAL);
 
 	spin_unlock_irqrestore(ioa_cfg->host->host_lock, host_lock_flags);
@@ -7557,6 +7573,12 @@ static void ipr_shutdown(struct pci_dev 
 	unsigned long lock_flags = 0;
 
 	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	while(ioa_cfg->in_reset_reload) {
+		spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+		wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
+		spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	}
+
 	ipr_initiate_ioa_bringdown(ioa_cfg, IPR_SHUTDOWN_NORMAL);
 	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
 	wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
_
-
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