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The vast majority of the busy/unbusy users in the tree don't acquire Giant before calling device_busy/unbusy. However, if multiple threads are opening a file, say, that causes the device to busy/unbusy, then we can race to the root marking things busy. Move to using a reference count to keep track of how many times a device_t has been made busy. Use that count to make the same decisions that we'd make with the old device state. Note: gpiopps.c uses D_TRACKCLOSE. Others do as well. However, there's a known race with closes that will be corrected for all the drivers that do this in a future commit. Sponsored by: Netflix Reviewed by: hselasky, jhb Differential Revision: https://reviews.freebsd.org/D26284 |
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| .. | ||
| pccard.c | ||
| pccard_cis.c | ||
| pccard_cis.h | ||
| pccard_cis_quirks.c | ||
| pccard_device.c | ||
| pccarddevs | ||
| pccardreg.h | ||
| pccardvar.h | ||
| pccardvarp.h | ||