linux-kernel - [PATCH 4/5] cciss: limit commands allocated on reset

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Message-ID: <20101022192117.25567.17893.stgit@beardog.cce.hp.com>
Date:	Fri, 22 Oct 2010 14:21:17 -0500
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	axboe@...nel.dk
Cc:	akpm@...ux-foundation.org, smcameron@...oo.com,
	linux-kernel@...r.kernel.org, mike.miller@...com, thenzl@...hat.com
Subject: [PATCH 4/5] cciss: limit commands allocated on reset_devices

From: Stephen M. Cameron <scameron@...rdog.cce.hp.com>

This is to conserve memory in a memory-limited kdump scenario

Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
---
 drivers/block/cciss.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 03afef8..55fed21 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4039,6 +4039,11 @@ static int __devinit cciss_find_cfgtables(ctlr_info_t *h)
 static void __devinit cciss_get_max_perf_mode_cmds(struct ctlr_info *h)
 {
 	h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
+
+	/* Limit commands in memory limited kdump scenario. */
+	if (reset_devices && h->max_commands > 32)
+		h->max_commands = 32;
+
 	if (h->max_commands < 16) {
 		dev_warn(&h->pdev->dev, "Controller reports "
 			"max supported commands of %d, an obvious lie. "

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