linux-kernel - [PATCH] megaraid_sas: Fix the search of first memory bar

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Date:   Sun, 21 Aug 2016 10:28:25 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     kashyap.desai@...gotech.com, sumit.saxena@...gotech.com,
        uday.lingala@...gotech.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     megaraidlinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] megaraid_sas: Fix the search of first memory bar

The 2nd parameter of 'find_first_bit' is the number of bits to search.
In this case, we are passing 'sizeof(unsigned long)' which is likely to
be 4.

It is likely that the number of bits in a long was expected here, so use
BITS_PER_LONG instead.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Other options are possible:
  - 'bar_list' being a 'unsigned long', use __ffs to reduce code verbosity
  - PCI_NUM_RESOURCES, which is the maximum number of bits that can be set
    by 'pci_select_bars()'
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index c1ed25adb17e..7d3de811d33c 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -5036,7 +5036,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
 
 	/* Find first memory bar */
 	bar_list = pci_select_bars(instance->pdev, IORESOURCE_MEM);
-	instance->bar = find_first_bit(&bar_list, sizeof(unsigned long));
+	instance->bar = find_first_bit(&bar_list, BITS_PER_LONG);
 	if (pci_request_selected_regions(instance->pdev, 1<<instance->bar,
 					 "megasas: LSI")) {
 		dev_printk(KERN_DEBUG, &instance->pdev->dev, "IO memory region busy!\n");
-- 
2.7.4


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