From: Ian Munsie Date: Wed, 3 Mar 2010 00:00:37 +0000 (+1100) Subject: USB: Remove large struct from the stack in USB storage isd200 driver X-Git-Tag: v2.6.35-rc1~471^2~220 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=0df4d8ef77f7e1251763d429f5ddbf5373961714;p=~emulex%2Finfiniband.git USB: Remove large struct from the stack in USB storage isd200 driver The compiler throws the following warning when compiling for a PowerPC 64 bit machine: drivers/usb/storage/isd200.c:580: warning: the frame size of 2208 bytes is larger than 2048 bytes There is a struct scsi_device which is placed on the stack and is largely responsible for such wastage. The struct is just a dummy struct filled with NULLs and set as the scsi_cmnd->device to make the usb_stor_Bulk_transport function happy. This patch makes the struct static, so that it is never placed onto the stack and silences the compiler warning. Signed-off-by: Ian Munsie Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c index fdba2f69d4c..e9cbc1467f7 100644 --- a/drivers/usb/storage/isd200.c +++ b/drivers/usb/storage/isd200.c @@ -490,13 +490,13 @@ static int isd200_action( struct us_data *us, int action, void* pointer, int value ) { union ata_cdb ata; - struct scsi_device srb_dev; + /* static to prevent this large struct being placed on the valuable stack */ + static struct scsi_device srb_dev; struct isd200_info *info = (struct isd200_info *)us->extra; struct scsi_cmnd *srb = &info->srb; int status; memset(&ata, 0, sizeof(ata)); - memset(&srb_dev, 0, sizeof(srb_dev)); srb->cmnd = info->cmnd; srb->device = &srb_dev; ++srb->serial_number;