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gpib: Suppress setting END on error from NI_USB dongle

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The NI USB adapter sets the END bit in the status word when an error
occurs such as a read being interrupted by the setting of ATN. This
happens for example when a device clear is received from the
controller in charge during a read.

The common driver changes the error return to 0 whenever the END bit
is set in order to avoid errors such as timeout or interrupt to be
reported after the full message has actually been read. The behaviour
of the NI USB adapter in setting the END bit on errors was causing
actual errors (-EINTR, -ETIMEDOUT) not to be reported.

We avoid setting the END bit in the ni_usb_gpib driver when an error
is reported in error_code of the status from the adaptor.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://patch.msgid.link/20260422074807.3194-1-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Penkler 2026-04-22 09:48:07 +02:00 committed by Greg Kroah-Hartman
parent 4f2d31d243
commit 7c19b47f5a
1 changed files with 1 additions and 1 deletions
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2
drivers/gpib/ni_usb/ni_usb_gpib.c
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@ -720,7 +720,7 @@ static int ni_usb_read(struct gpib_board *board, u8 *buffer, size_t length,
break;
}
ni_usb_soft_update_status(board, status.ibsta, 0);
if (status.ibsta & END)
if ((status.ibsta & END) && (status.error_code == NIUSB_NO_ERROR))
*end = 1;
else
*end = 0;