rts5139/rtsx_usb borked in 3.15+

As is pointed out in an answer to RTS5129 Card Reader with Ubuntu 15.10, asymingt wrote a temporary fix this.

Direct link to the github repo: https://github.com/asymingt/rts5139

Just an idea: partitions on memory cards are now found under names such as /dev/mmcblk0p1. Maybe you have been waiting for /dev/sdb1 to appear? Make sure rtsx_usb is loaded and try to mount /dev/mmcblk0p1 (or a similar name).

If that's not a solution for you, you might want to modprobe rtsx_usb and post the related output of dmesg? In my case, it's

usbcore: registered new interface driver rtsx_usb
mmc0: new SDHC card at address e624
mmcblk0: mmc0:e624 SD04G 3.69 GiB 
mmcblk0: p1

Of course, you would make sure that the rtsx_usb_-related modules aren't already loaded when you modprobe.

Just as an additional info:

lsmod | grep rts

rtsx_usb_ms            16899  0 
memstick               13696  1 rtsx_usb_ms
rtsx_usb_sdmmc         25280  0 
rtsx_usb               17541  2 rtsx_usb_sdmmc,rtsx_usb_ms
mmc_core              102374  2 mmc_block,rtsx_usb_sdmmc
mfd_core               12601  2 lpc_ich,rtsx_usb
usbcore               195340  7 usblp,uvcvideo,rtsx_usb,ehci_hcd,ehci_pci,usbhid,xhci_hcd