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USB: android gadget: mass storage: Fix format issue for Vista Host

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As part of formating the mass storage device, Host sends the INQUIRY
scsi command. As per the standard, the command length for this
command should be 6 bytes, whereas the Vista host sends 12 bytes.

When the command length of the command is not equal to the standard
length, the device sends a phase error as part of the status phase.
When the host receives a phase error, it re-enumerates, hence the
error.

If the command is INQUIRY, and the command length is 12 bytes,
treating this as a good command and not sending the phase error
to the host fixes this issue.

Signed-off-by: Velempati Chiranjeevi <c_cvelem@qualcomm.com>
Signed-off-by: Mike Lockwood <lockwood@android.com>
This commit is contained in:
Velempati Chiranjeevi
2009-10-21 09:53:10 +05:30
committed by Colin Cross
parent fdcec72817
commit c600bd3a24
1 changed files with 4 additions and 3 deletions
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7
drivers/usb/gadget/f_mass_storage_tmp.c
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@@ -1740,9 +1740,10 @@ static int check_command(struct fsg_dev *fsg, int cmnd_size,
/* Verify the length of the command itself */
if (cmnd_size != fsg->cmnd_size) {
/* Special case workaround: MS-Windows issues REQUEST SENSE
* with cbw->Length == 12 (it should be 6). */
if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
/* Special case workaround: MS-Windows issues REQUEST_SENSE
* and INQUIRY commands with cbw->Length == 12 (it should be 6). */
if ((fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
|| (fsg->cmnd[0] == SC_INQUIRY && fsg->cmnd_size == 12))
cmnd_size = fsg->cmnd_size;
else {
fsg->phase_error = 1;