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Date: Wed, 26 Jan 2011 11:23:18 -0600 From: Robert Jennings <rcj@...ux.vnet.ibm.com> To: Nitin Gupta <ngupta@...are.org> Cc: Greg Kroah-Hartman <gregkh@...e.de>, Pekka Enberg <penberg@...helsinki.fi>, devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org Subject: [PATCH 2/7] zram: Prevent overflow in logical block size On a 64K page kernel, the value PAGE_SIZE passed to blk_queue_logical_block_size would overflow the logical block size argument (resulting in setting it to 0). Take the minimum of PAGE_SIZE or 4096 and use this for the block device logical block size. Signed-off-by: Robert Jennings <rcj@...ux.vnet.ibm.com> --- drivers/staging/zram/zram_drv.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index d0e9e02..d5e0275 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -621,7 +621,8 @@ static int create_device(struct zram *zram, int device_id) * and n*PAGE_SIZED sized I/O requests. */ blk_queue_physical_block_size(zram->disk->queue, PAGE_SIZE); - blk_queue_logical_block_size(zram->disk->queue, PAGE_SIZE); + blk_queue_logical_block_size(zram->disk->queue, + (unsigned short) min_t(unsigned int, PAGE_SIZE, 4096)); blk_queue_io_min(zram->disk->queue, PAGE_SIZE); blk_queue_io_opt(zram->disk->queue, PAGE_SIZE); -- 1.6.0.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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