I've been trying to troubleshoot an issue, but lacking experience working
in the kernel, and not being able to find this same issue discussed
elsewhere, I could use some help.
Basically, I have a USB communication class device interface with my BBB
that only works once between booting. I'll power up, send a character
command to the device, and get the expected response back ... but if I send
the same command again, fgets never returns a non-null string. If I reboot
the BBB, I can send the command and get the expected response back, but,
again, only once.
Other USB issues I've seen discuss power, and my device is bus-powered, but
I don't think it's a power issue, as I found the following in dmesg, which
doesn't seem to relate to power (this message appears after the first time
sending a command to the device, and every time thereafter):
WARNING: at drivers/usb/musb/musb_host.c:125
musb_h_tx_flush_fifo+0x35/0x5c()
Any ideas on how to troubleshoot this? Again, I have no experience working
in the kernel, so I'm at a loss. My only idea was to examine the code
throwing the warning, but, mysteriously, I searched the entire file system
(find / musb_host.c) and couldn't locate musb_host.c ... how could that
file be throwing the warning if it seemingly doesn't exist on my file
system?
This is a company project and we're willing to pay for a solution at this
point.
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