linux-kernel - [PATCH 2/4] [SCSI]stex: extend hard reset wait time

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Date:	Fri, 30 Mar 2007 15:21:35 -0700
From:	"Ed Lin" <ed.lin@...mise.com>
To:	"linux-scsi" <linux-scsi@...r.kernel.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"james.Bottomley" <james.Bottomley@...elEye.com>,
	"jeff" <jeff@...zik.org>,
	"promise_linux" <promise_linux@...mise.com>
Subject: [PATCH 2/4] [SCSI]stex: extend hard reset wait time

During hard bus reset of st_shasta controllers, 1 ms is not enough for
16-port controllers, although it's good for 8-port controllers.  Extend the
wait time to 100  ms to allow bus resets finish successfully.

Signed-off-by: Ed Lin <ed.lin@...mise.com>
---
diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 4d68533..1e8d7ac 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -1055,7 +1055,12 @@ static void stex_hard_reset(struct st_hb
 	pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &pci_bctl);
 	pci_bctl |= PCI_BRIDGE_CTL_BUS_RESET;
 	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);
-	msleep(1);
+
+	/*
+	 * 1 ms may be enough for 8-port controllers. But 16-port controllers
+	 * require more time to finish bus reset. Use 100 ms here for safety
+	 */
+	msleep(100);
 	pci_bctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);
 


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