On Thu, Sep 15, 2016 at 03:15:53PM +0200, Hans Verkuil wrote: > It could be related to the fact that a PCI write may be delayed unless > it is followed by a read (see also the comments in > drivers/media/pci/ivtv/ivtv-driver.h).
Thanks for explanation! > That was probably the reason for the pci_read_config_word in the reg_write > code. Try putting that back (and just that). In this case reg_write becomes not atomic, thus spinlock would be required again here, right?
