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usb: gadget: f_mass_storage: Stop ums on START-STOP UNIT SCSI command

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Exit the UMS handler loop in case START-STOP UNIT SCSI command is
received. This is sent e.g. by the util-linux eject(1) command and
indicates to the device that it is supposed to spin down the media
and enter low power state.

This effectively adds support for exitting the 'ums' command from
host using 'eject /dev/sdN' that is on par with 'dfu-util -e' .

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20231107001018.55640-1-marex@denx.de
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
This commit is contained in:
Marek Vasut
2023-11-07 01:09:59 +01:00
committed by Mattijs Korpershoek
parent f490623309
commit 1041ee64eb
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/gadget/f_mass_storage.c
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@@ -327,6 +327,7 @@ struct fsg_common {
unsigned int short_packet_received:1;
unsigned int bad_lun_okay:1;
unsigned int running:1;
unsigned int eject:1;
int thread_wakeup_needed;
struct completion thread_notifier;
@@ -669,6 +670,10 @@ static int sleep_thread(struct fsg_common *common)
}
if (k == 10) {
/* Handle START-STOP UNIT */
if (common->eject)
return -EPIPE;
/* Handle CTRL+C */
if (ctrlc())
return -EPIPE;
@@ -1325,6 +1330,8 @@ static int do_start_stop(struct fsg_common *common)
return -EINVAL;
}
common->eject = 1;
return 0;
}