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staging: unisys: visorbus: add error handling to boottotool_show 

Don't just drop the error from visorchannel_read on the floor, report it.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Kershner 2017-03-28 09:34:24 -04:00 committed by Greg Kroah-Hartman
parent 002a5abb23
commit 0b01c6ce5a
1 changed files with 9 additions and 4 deletions
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13
drivers/staging/unisys/visorbus/visorchipset.c
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@ -130,11 +130,16 @@ static ssize_t boottotool_show(struct device *dev,
char *buf)
{
struct efi_spar_indication efi_spar_indication;
int err;
visorchannel_read(chipset_dev->controlvm_channel,
offsetof(struct spar_controlvm_channel_protocol,
efi_spar_ind), &efi_spar_indication,
sizeof(struct efi_spar_indication));
err = visorchannel_read(chipset_dev->controlvm_channel,
offsetof(struct spar_controlvm_channel_protocol,
efi_spar_ind),
&efi_spar_indication,
sizeof(struct efi_spar_indication));
if (err)
return err;
return sprintf(buf, "%u\n", efi_spar_indication.boot_to_tool);
}