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[PATCH] PATCH: usb-storage: allocate separate sense buffer

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This patch is from Alan Stern (as560).  It has been rediffed against a
current tree.

This patch allocates a separate buffer for usb-storage to use when
auto-sensing.  Up to now we have been using the sense buffer embedded in a
scsi_cmnd struct, which is dangerous on hosts that (a) don't do
cache-coherent DMA or (b) have DMA alignment restrictions.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2005-10-23 19:40:22 -07:00
committed by Greg Kroah-Hartman
parent b876aef7f8
commit bbafa4668f
3 changed files with 13 additions and 2 deletions
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8
drivers/usb/storage/usb.c
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@@ -467,6 +467,12 @@ static int associate_dev(struct us_data *us, struct usb_interface *intf)
US_DEBUGP("I/O buffer allocation failed\n");
return -ENOMEM;
}
us->sensebuf = kmalloc(US_SENSE_SIZE, GFP_KERNEL);
if (!us->sensebuf) {
US_DEBUGP("Sense buffer allocation failed\n");
return -ENOMEM;
}
return 0;
}
@@ -800,6 +806,8 @@ static void dissociate_dev(struct us_data *us)
{
US_DEBUGP("-- %s\n", __FUNCTION__);
kfree(us->sensebuf);
/* Free the device-related DMA-mapped buffers */
if (us->cr)
usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,