kernel/linux.git/drivers/usb/storage/usb.c, branch linux-4.20.y

USB: storage: remove invalid URL from drivers

2018-01-23T09:22:34+00:00

The old URL for usb-storage driver help is long gone. So remove it from the comments to not confuse people anymore. Reported-by: Matthew Dharm Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman

USB: storage: Remove obsolete "FIXME"

2017-12-06T08:21:18+00:00

The fix of "FIXME: Notify the subdrivers..." doesn't actually have any real effect. The "FIXME" changed to simple comment. Signed-off-by: Mikhail Zaytsev Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman

USB: storage: Remove redundant license text

2017-11-04T10:55:38+00:00

Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Oliver Neukum Signed-off-by: Greg Kroah-Hartman Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman

USB: add SPDX identifiers to all remaining files in drivers/usb/

2017-11-04T10:48:02+00:00

It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the drivers/usb/ and include/linux/usb* files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Thomas Gleixner Cc: Kate Stewart Cc: Philippe Ombredanne Signed-off-by: Greg Kroah-Hartman Acked-by: Felipe Balbi Acked-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman

usb-storage: make use of srb local variable

2017-11-01T15:57:23+00:00

Commit 8b52291a0743 ("usb-storage: fix deadlock involving host lock and scsi_done") added a local variable to usb_stor_control_thread() in the usb-storage driver. This local variable holds the value of us->srb, for use after the host lock has been released. But as long as we have the value in a local variable, we may as well use it instead of dereferencing the us pointer all over the place. This patch makes no functional change; it just makes the code a little shorter and a little neater. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman

usb-storage: fix deadlock involving host lock and scsi_done

2017-07-30T14:18:27+00:00

Christoph Hellwig says that since version 4.12, the kernel switched to using blk-mq by default. The old code used a softirq for handling request completions, but blk-mq can handle completions in the caller's context. This may cause a problem for usb-storage, because it invokes the ->scsi_done callback while holding the host lock, and the completion routine sometimes tries to acquire the same lock (when running the error handler, for example). The consequence is that the existing code will sometimes deadlock upon error completion of a SCSI command (with a lockdep warning). This is easy enough to fix, since usb-storage doesn't really need to hold the host lock while the callback runs. It was simpler to write it that way, but moving the call outside the locked region is pretty easy and there's no downside. That's what this patch does. Signed-off-by: Alan Stern Reported-and-tested-by: Arthur Marsh CC: Christoph Hellwig CC: Signed-off-by: Greg Kroah-Hartman

USB: storage: refactor endpoint retrieval

2017-03-23T12:54:08+00:00

Use the new endpoint helpers to lookup the required bulk-in and bulk-out endpoints and the (typically) optional interrupt-in endpoint. Cc: usb-storage@lists.one-eyed-alien.net Signed-off-by: Johan Hovold Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman

usb: storage: drop freezer.h usage

2016-11-07T09:19:49+00:00

usb-storage does not use any freezer apis, so drop the inclusion of freezer.h from the drivers/usb/storage/usb.c file. Signed-off-by: Greg Kroah-Hartman

scsi: introduce a quirk for false cache reporting

2016-09-13T06:08:24+00:00

Some SATA to USB bridges fail to cooperate with some drives resulting in no cache being present being reported to the host. That causes the host to skip sending a command to synchronize caches. That causes data loss when the drive is powered down. Signed-off-by: Oliver Neukum Reviewed-by: Martin K. Petersen Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman

usb: storage: usb: don't print error when allocating urb fails

2016-08-15T13:54:27+00:00

kmalloc will print enough information in case of failure. Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman