tree 8d7bf79b403292e98a337fb50b397177d0fe918f
parent c9c3395d5e3dcc6daee66c6908354d47bf98cb0c
author Marc Zyngier <maz@kernel.org> 1676918367 +0000
committer Marc Zyngier <maz@kernel.org> 1676918943 +0000

genirq/msi: Take the per-device MSI lock before validating the control structure

Calling msi_ctrl_valid() ultimately results in calling
msi_get_device_domain(), which requires holding the device MSI lock.

However, we take that lock right after having called msi_ctrl_valid(),
which is just a tad too late. Taking the lock earlier solves the issue.

Fixes: 40742716f294 ("genirq/msi: Make msi_add_simple_msi_descs() device domain aware")
Reported-by: "Russell King (Oracle)" <linux@armlinux.org.uk>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/Y/Opu6ETe3ZzZ/8E@shell.armlinux.org.uk