usb: usbtmc: Add ioctl USBTMC488_IOCTL_WAIT_SRQ

PATCH New Oliver Neukum 1 participant 1 message May 28, 2018 USB

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Oliver Neukum

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2018-05-28 12:36 UTC #0 lore raw

PATCH 7/12 usb: usbtmc: Add ioctl USBTMC488_IOCTL_WAIT_SRQ

Am Montag, den 28.05.2018, 10:59 +0000 schrieb guido@kiener- muenchen.de:

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Quoted 2 lines
No, the problem is that you will underflow io->mutex
Don't worry. The function usbtmc488_ioctl_wait_srq is called by usbtmc_ioctl which already locks the mutex. See
https://elixir.bootlin.com/linux/v4.17-rc7/source/drivers/usb/class/usbtmc.c#L1189
So the mutex is just unlocked here to allow other threads to still communicate with the device.

Hi,

thanks I had overlooked that.

Regards
Oliver
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